43: How do I make Emacs "typeover" or "overwrite" instead of inserting?

  M-x overwrite-mode (a minor mode).  This toggles overwrite-mode on and
  off, so exiting from overwrite-mode is as easy as another M-x
  overwrite-mode.

  On some workstations, the "Insert" key toggles overwrite-mode on and off.

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